Carburetor



J. J UHASZ CARBURETOR FiledNov. 13. 1925 2 sheets-sheet 1 R m W W 2Sheets-Sheet Oct. 29, 1929. J. JUHAsz CARBURETOR Filed Nov. 13, 1925patented @cto 29, 1929 SGEN J'UHASZ, @E NEW YEK, N. Y..

GARE'UEETQE l application met. november is, i925. serial no. casas.

'llhe present invention relates to improvements in carburetors, and moreparticularly tothe general type of construction which is disclosed in myapplication for U. S. Letters Patent Ser. No. 684,765, led January 7,1924, which has resulted in Patent #1,694,386, J an. 7, 1924, althoughapplicable to other constructions just as well. ln the said applicationa carburetor isdescribed including a plu-` rality of independentcarbureting chambers, a throttle for progressively bringing saidcarbureting chambers into service, and a suction-controlled nozzle ineach carbureting chamber, said nozzles being of dierent 5 lengths,increasing in length in the order into which said carbureting chambersare brought into service, and each nozzle having a bore graduallydecreasing in transverse cross-section 'from its upper end to its lowerend.

The main or mostfrequentcause of carburetor troubles is due to the factthat the nozzles thereof are apt to be clogged by foreign substances inthe liquid fuel. In order to avoid this trouble, usually a fuel screen 5is employed in the pipe line leading to the carburetor. This screenmust, obviously, be cleaned from time to time and this can beaccomplished onlyk while the engine, on which the carburetor is mounted,is at` full stop.

Notwithstanding this screen, foreign matter nds its way into the nozzlesof the carburetor, so that the same must be cleaned from time to time.ln order to do this, `obviously, the carburetor must be taken apart. Itcan then be assembled only by skilled mechanics, owing .to the fact thatne adjustments must be made to bring it back to working condition. Whenthe screen is cleaned and also when the carburetor is taken apart, aconsiderable quantity of fuel is wasted.

ln carburetors which are constructed for variable speed and loadengines, the nozzles are usually valve-controlled. In most casesneedle-valves are provided. These needle valves extend in practicallyall Vconstructions into the carburetor from below, and are, for thisreason, to some extent inaccessible.

The main object of the present invention is to provide a carburetorconstructlon, wherein the fuel screens are disposed within thecarburetor casing, and are so located that they can be withdrawn, forcleaning purposes, without interfering with the operation of the engineandI without waste of fuel.

Another object of the invention is to provide a carburetor havingatomizing or spraying nozzles and metering or Calibrating nozzlesarranged in series with said spraying or atomizing nozzles,theparrangement being such that the metering nozzles can be withdrawnfrom the carburetor while the engine is running.

p With these and other objects in view, which will more fully appear asthe nature of the invention is better understood, the same consists inthe combination, arrangement and construction of parts hereinafterdescribed, pointed out in the appended claims and illustrated in theaccompanying drawings, it being understood that many changes may be madein the size and proportion of the several parts and details ofconstruction within the scope of the appended claims, without departingfrom the spirit or sacricing any of the advantages ofthe invention. i

@ne of the many possible embodiments of the invention is illustrated inthe accompanying drawings, in which Figure 1 is a top plan view of acarburetor constructed in accordance with the present invention; Fig. 2is a central vertical section taken therethrough; Fig. 3 is a sectiontaken on line 3-3 of Fig. 2; Fig. 4 is a section similar to the oneshown in Fig. 2 of the lower portion of the carburetor, on a largerscale;

and Fig. 5 is a section similar to the one shown in-Fig. 4 of a modifieddevice. f

Referring now first to Figs. 1 to 4, inclusive, of the drawings, thenumeral 10 indicates a carbureter casing, in the side of which is formedan opening 11, forming the air inlet to the carbureting chambers 12, ofwhich three are shown in the drawings, although any other suitablenumber may be employed according to the requirements. These cham- Vbersare in thepresent case in the form of Venturi passages.

Into each of these chambers projects a spraying or atomizing nozzle I13.Each of these nozzles communicates through a pas-v or calibrating nozzle15. 'lhese 22 mensa-s sage ll with a metering or Calibrating nozzle 15,the latter communicating, as will hereinafter appear, through a passage16 with a :float chamber 17 of any suitable construction. Above thecarbureting chambers is disposed a throttle 18, in the present case acylindrical throttle, for the well know purpose.

The spraying or atomizing nozzles 13 are or the construction describedin the application for Letters Patent above referred to, the elements ofeach nozzle being held in proper position within the carburetor casingby a screw plug 19, having an aperture 20 in constant communication withthe respective passage 1li. 'lhese apertures .are loi' the maximum sizerequired ior the respective carbureting chambers, and are alsosufficiently large to permit of the passage of any foreign matter whichmay come through the metering or calibrating nozzles 15.

With each spraying or atomizing nozzle is associated, as above stated, ametering Calibrating nozzles are alike in construction, each of the samebeing, preferably, disposed in the plane of the spraying or atomizingnozzle associated therewith and extending at an acute angle thereto.rlhese metering or Calibrating nozzles are each located in a bore 21,the lower section of which connects the passage 16 with one of thepassages 14:.' rlhese bores are internally screw-threaded at their upperends, as shown at 22, the said threads meshing with exterior threads ona shoulder 23 of a tubular body 24, the latter havin@ an outer diameterthat is smaller than the iamettr of the bore 21 associated therewith, sothat between the said .tubular body and the wall of the bore is providedan annular passage 25. Below the passage 16 is provided.' in eachbore`2l. a valve seat 26, for cooperation with the conical lower section2'? rl`he upper end of each tubular body 2li is closed by. a,preferably, milled head 28, which is disposed outside of the carburetorcasing, and the lower end of each tubular member is closed by a plug 29,provided with an orifice 30. rlhis plug constitutes the metering 15, itsoritice being smaller than the aperture 20 in the spraying or atomizingnozzle 13 asf sociated therewith, as clearly shown in Fig.

4 of the drawings. The plugs may' be mounted on'the tubular bodies 24 inany suitable manner. lin the caw illustrated in the drawings, each plugis provided with exterior screw-threads 31, meshing with interiorscrewthreads 32 on the lower end of the respective tubular body 24. Eachof the tubular bodies 24 is provided with a plurality of openings 33adjacent its lower end, the said openings lbeing covered by aiine-meshed wire fabric 34, which may be held in place in any suitablemanner. The fuel, issuing from the passage 16, passes through theopenings 33 into the of the tubular body 24.'

tubular bodies 24e, and through the orii'ices 3G in the plugs 29 thereoninto the passages 14: toward the spraying or atomizing nozzles 13.

The operation of this device is as ollovvs: As stated above, theapertures 20 in the plugs 19 are et' the maximum. size required theVenturi passagesassociated therewith. The

orices 3() in the plugs 29, on the other hand, are of smaller size thanthe apertures 20, they being dimensioned to permit of a passage el theproper amount ot fuel to the engine, on which the carburetor is mounted.@ne ci the metering or calihrating nozzles is provided with an orilice30 of a size so as supply fuel to the spraying or atomizing nozzleassociated therewith when the engine is running idle or at low speed,and the other metering or Calibrating nozzles are provided with oricesfor supplying fuel at higher speeds, thethrottle valve being soconstructed that it brings the carbureting chambers progressively intoservice. .it is to. be noted that the fuel ows from the passage 16 intothe metering or calibrating nozzle it passing through the screens 34: sothat all foreign matter is prevented from passing through the oritices30 in the plugs 29, attention being called to the fact that the uelElows from the interior ot the tubular bodies 2d downwards into thepassages 14 and then upwards through the apertures 20 into the Isprayingor atomizing nozzles. The :foreign matter collects in theV drawn throughthe latter toward the engine, f f

the apertures 20 being large enough to prevent clogging of the same.llnasmuch as the upper ends of the bores 21 extend above the normallevel of the fuel in the lloat chamber 17, the metering nozzles may-beremoved, as a whole, from the carburetor without loss oli fuel and whilethe engine is kept in operation. These metering or calibrating nozzlesare removed from time to time in order to intended to put a new set ofplugs 29 in position thereon, in' case smaller or larger calibratinorices are to be used in the operation o the en ine. With eachcarburetor furnished a p urality of sets of plugs 29 to allow thedesired adjustment to be made. The apertures 20 in `the plugs 19 must beof a size to permit stalling of the en e when the Calibrating nozzlesare remove from the carburetor; that is to say they must be of a sizewhich will prevent the formation of an overreach mixture with theCalibrating nozzles removed from the carburetor.,

The modification illustrated in Fig. 5 differs from those abovedescribed in that the clean the screens thereon, and also when it is` iscreen being removable,

messes ealibrating or metering nozzle is provided with a needle valve35. rllhe pointed end of this valve co-operates with they Calibratingorifice 30 in the plug 29, the needle extending through the head 28 ofthe tubular` body 24, it being provided with screw-threads 36, meshingwith threads in the head 28. rlhe needle valve is providedwith a,preferably,

milled knob 37, which is disposed above the head 28 ln order to preventthe needle valve from rotating in one or the other direction after theproper adjustment has been made, a spring^ 38 is iixed to the carburetorcasing, said spring bearing against the milled knob?.

lt is to be noted that the metering or calibrating nozzles areconveniently accessible, they being ldisposed at the side ofthecarburetorcasing, in contradistinction to most of thestructures'heretofore in use in which the adjustments are made rombelow. `Whatlclaim is Y l. A carburetor including a carbureting chamber,a spraying or vaporizing nozzle therein, said carburetor being providedwith of October, A. D. 1925.

JOHN JUHYVAS a bore, a float chamber, a communication between said floatchamber and said bore, a communication between said bore and saidnozzle, a Calibrating nozzle` removably mounted in said bore, a valveseat formed in said bore between its inlet and outlet, an enlargement onsaid Calibrating nozzle for cooperation Awith said valve seat, saidcalibrating nozzle being hollow and provided with an opening above saidenlargement through which the :tuel flows from said bore into saidCalibrating nozzle, and a screen covering said opening, said calibratinnozzle .and said a unit, Jfrom the carburetor and the inlet to -saidspraying or vaporizing nozzle being larger than the calibrating open ingin said calibrating nozzle but not large enough toi cause formation ofan overrich miture when said calibrating nozzle is removed from thecarburetor.

2. A carburetor including a carbureting chamber, a spraying orvaporizing nozzle therein, said carburetor being provided with a bore, ailoat chamber, a communication between said float chamber and said bore,a

communication between said bore and said nozzle, a tubular body 1n saldbore closing the upper end of the latter, said tubular body having anouter diameter smaller than the inner diameter of said bore, a valveseat formed in said bore between its inlet and outlet,y an enlargementon the lower end of said tubular body for (A30-operation with said valveseat, a Calibrating plug closing the lower end of said tubular body,said tubular body being provided with an opening above said enlargementthrough which the fuel flows from said bore toward said Calibratingplug; and a screen covering said opening, said tubular body, Calibratingplug and screen being re-

